Abstract
Using a “standard” NMR spin-echo technique we determined the spin polarization of two-dimensional electrons, confined to GaAs quantum wells, from the hyperfine shift of Ga nuclei located in the wells. Concentrating on the temperature ( ) and magnetic field ( ) dependencies of at Landau level filling factor , we find that the results are described well by a simple model of noninteracting composite fermions, although some inconsistencies remain when the two-dimensional electron system is tilted in the magnetic field.
- Received 6 August 1999
DOI:https://doi.org/10.1103/PhysRevLett.84.354
©2000 American Physical Society